A big 5" triplet will take a while to cool, just like your SCT. A 5" triplet will not be good on a Skyview Deluxe mount likely. They're heavy ~20lb scopes.
Since your goal is faster deployment and you want to use a manual mount sometimes and compliment your SCT, I would look at:
Skywatcher PRO ED100 F9 (FPL53 glass)
T.S. 102mm F7 APO (FPL53 glass)
T.S. 102mm F11 ED
Three different and interesting scopes.
127/130mm is a nice all around scope. I had a 127-f8 achro for many years. It was very sharp in focus. But as achro's tend to be it wasn't the best on bright objects such as moon and planets. Great at lower powers. Just fun.
For visual personally I would not go below 100mm unless you want to use it for wider field low power use. As the longer FL higher F# refractors in smaller diameter objectives can get a bit dark in the visual view.
The TS F-11 is a very interesting scope, but as an only scope it is more useful as a moon/planetary visual observer than an overall use scope. I would like to have one though. Good value.
The shorter TS triplet would probably be a very good quick grab scope. It should be very sharp and nearly color free.
The 100ed f-9 is a nice scope a bit long, but not as long as the TS-f11. Good optics, but a bit underwhelming mechanically, the focuser in particular could be a lot better.
I think the TS triplet scopes come in a 115mm version as well as a 130mm.
A few things to consider in a scope choice of this general size; first what objects are you going to try to view and how wide are they.
For planets you don't want to be too short or you won't see much detail. 1000+mm fl. The problem is 1000mm fl requires a substantial mount and its associated weight. Maybe not the best grab & go.
The shorter APO triplets have the advantage as a quick use scope. A good mount is necessary, but you could use an HEQ-5 instead of an Atlas EQ6. Or even a light weight alt/az simple mount for that ultra light grab&go. I would favor the 115's in this range shorter triplet scopes. Say around 600/700mm FL. They would probably work for imaging too.
Field of view and light gathering power are really target object specific. And some objects will just require more aperture than is cost and size practical in a refractor. So ask yourself what it is that you want to look at. Then match the scope to it. You will probably find that you need a pair of binoculars and 3 different scopes (and probably 2 mounts)(not to mentionthe number of eyepieces).
Just remember to purchase quality at a reasonable value. Doing so will retain the resale value and you will find your astro stuff will not devalue much and it will be sought after on the preowned market when you want to upgrade. I like to buy gear on the cn classifieds as you can usually get it for 1/3 off new price or better. But some of the rarer greatly sought after items may hold their new price value very well. Might even be at a premium. You just have to have a clear picture of what you really want.
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